If I stop a long running query, does it rollback?

Question

A query that is used to loop through 17 millions records to remove duplicates has been running now for about 16 hours and I wanted to know if the query is sto

Answer 1

Also try thinking another method to remove duplicate rows:

delete t1 from table1 as t1 where exists (
    select * from table1 as t2 where
        t1.column1=t2.column1 and
        t1.column2=t2.column2 and
        t1.column3=t2.column3 and
        --add other colums if any
        t1.id>t2.id
)

I suppose that you have an integer id column in your table.